[Rails] don't persist a model on condition

Hi, does anyone have some suggestion as to how I would NOT persist a model if some condition/attribute check of the model instance is true?

The condition would be some method I run using before_save or similar, and i would like a method within the model to set some parameter of the model which would render it not saveable (no error or notice should be triggered) -- if it was a new instance, and would delete an existing instance of it from the DB. 

Using ActiveRecord.

Thanks

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